== sanity test 101b: check stride-io mode read-ahead =========================================================================== 05:25:01 (1789637101)
striped dir -i1 -c2 -H crush2  /mnt/lustre/d101b.sanity

1.241843s, 6.75497MB/s
Read-ahead success for size 8192

1.155405s, 7.26032MB/s
Read-ahead success for size 16384

1.379358s, 6.08153MB/s
Read-ahead success for size 32768

1.032849s, 8.12181MB/s
Read-ahead success for size 65536

0.960710s, 8.73168MB/s
Read-ahead success for size 131072

0.966165s, 8.68238MB/s
Read-ahead success for size 262144

0.898709s, 9.33406MB/s
Read-ahead success for size 524288

0.865841s, 9.68839MB/s
Read-ahead success for size 1048576